Ten MLB umpires are 'set to retire at the end of the month' - the LARGEST turnover since 1999
Ten MLB Umpires Retiring, Most Since 1999
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe
10 Things I Think I Think for Monday, September 30, by John Thorn
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Trevor Hoffman's Hall of Fame case: Examining the closer's career - Sports Illustrated
MLB Twitter reacts to mass retirement of major league umpires: Don't let the door hit you on the way out, Wish Angel Hernandez was on this list
Gibson makes final call: MLB umpire retires after 24-year career, Sports
10 Major League Baseball umpires retire in historic exodus
Sources - 10 MLB umps retiring, most since '99 - TSN.ca
The life of an MLB umpire, 07/04/2016
Are there any accounts or published records indicating which MLB umpires have had the highest and lowest percentage of calls overturned since the advent of video replay? - Quora
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